This guide describes how to install Windows Virtual PC and set up a virtual environment, such as Windows XP mode or a custom virtual machine. It also shows you how to try out some of the key features of Windows Virtual PC.

"No key is required for this product" -> Good to know :D
Downloading now.. but...
Q: "Is AMD-V or Intel VT a must-have to run Windows Virtual PC?"
A: "Yes. To determine if your CPU includes AMD-V or Intel VT features, check with your PC’s manufacturer."
Now.. both at home and at my company we run mostly Intels, and 99% of them are E2xxx and E4xxx CPUs. Now I have to find out if they support Intel VT.. And I thought that I'll never have to worry about that feature on client PCs :/

OK, E2xxx obdiously don't support Intel VT, as none of the E4xxx series suports it. E5xxx isn't listed again, but again I doubt it supports it as E7xxx series is listed as not supporting it either ( http://www.intel.com/products/processor_number/chart/core2duo.htm ).
So cheapest Intel CPU supporting this is good old E6xxx series if you have them, or can find them somewhere. Otherwise you're left with just E8200 and higher CPUs that don't exactly come cheap.
So that's out the window.. sure I'll be able to use it at my SINGLE home computer when I upgrade CPU in the comming months. But in my corporate enviroment it's useless, as those E2xxx are just about year old, and won't be changed for at least two more years.
On the other hand, AMD CPUs which are less than 50% in price are supporting virtualization.. Nice pull Intel.. next time we're going AMD.